Granted Patent
Utility
US 6,358,634 · App. 09/504,122
Nitrogen-containing heterocyclic compound, organic light-emitting device material and organic light-emitting device
Inventors:
Tatsuya Igarashi, Hisashi Okada
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Feb 15, 2000
Inventors
Tatsuya Igarashi
Hisashi Okada
Assignee (at issue)
Fujitsu Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.